Ceiling fan



FIG. 1 is a side elevational view of a ceiling fan showing my new design, the opposite and adjacent sides being identical in appearance and the broken-line showing of the fan blades being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and

FIG. 4 is a bottom perspective view thereof. 

The ornamental design for ceiling fan, substantially as shown and described. 